Bug#896388: python-libtiff: libtiff fails to import

[Helmut Grohne <helmut@subdivi.de>]

Package: python-libtiff
Version: 0.4.1+20160502-1
Severity: serious
User: helmutg@debian.org
Usertags: python-import

After installing python-libtiff importing the module libtiff
into a python interpreter fails with the following error:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/libtiff/__init__.py", line 20, in <module>
    from .libtiff_ctypes import libtiff, TIFF, TIFF3D
  File "/usr/lib/python2.7/dist-packages/libtiff/libtiff_ctypes.py", line 56, in <module>
    raise ImportError('Failed to find TIFF library. Make sure that libtiff is installed and its location is listed in PATH|LD_LIBRARY_PATH|..')
ImportError: Failed to find TIFF library. Make sure that libtiff is installed and its location is listed in PATH|LD_LIBRARY_PATH|..

The vast majority of import failures is attributed to missing dependencies.
Often times that manifests as an ImportError or ModuleNotFoundError.
Typically, dependencies should be inserted by dh-python via ${python:Depends}
or ${python3:Depends}. Thus a missing dependency can be caused by incomplete
install_requires in setup.py. Sometimes a missing dependency of a dependency
is the cause, in such cases this bug should be reassigned.

Helmut